南昌站铁路站房屋盖网架施工过程模拟及方案对比分析

针对网架传统施工方案中质量要求高、装配累积误差大、施工难度大、安装精度难以控制等问题,以南昌站铁路站房屋盖网架施工为例,结合现有空间网架施工技术提出了回顶法安装方案。基于ANSYS中的单元生死技术,对传统法和回顶法两种方案的网架拼装过程进行了数值模拟,获得了不同方案施工过程中网架结构的变形及应力状态,并对模拟结果进行了对比分析。结果表明:与传统法施工方案相比,回顶法施工方案能够使网架结构变形及应力有所减小,具有较强的适用性。该研究成果可为类似网架工程的施工安全性和精确成型提供理论依据。     

机场路收费中心收费岛大门网架施工作业程序及质量保证的要点

哈尔滨市机场高速公路收费站被誉为黑龙江省第一门;其主体结构由平面网架和曲面网架组 合而成,整体悬吊于两片对称的H形支柱上,其中平面网架采用螺栓球节点;曲面网架采用管式相贯节点,其 线形优美、自然流畅。     

悬索结构在网架施工中应用的初探

网架结构在各种建筑中的应用越来越多,网架的施工方法却没有发展,引入悬索结构为网架施工搭设施工平台。用单索计算理论计算主索和副索的所受最大水平拉力,确定其最小直径。对搭设悬索平台和搭设满堂脚手架进行经济分析。通过工程实例阐述了悬索平台的可行性。     

大跨度钢桁架在烟厂项目中的应用

卷烟厂项目中大跨度厂房多采用网架结构体系，与网架结构体系对比，虽然采用大跨度钢桁架用钢量稍大，但能减少3m的层高，可以减少空调和采暖的能耗，从而达到节能的目的，获得长期效益。本文结合长春卷烟厂项目，根据反应谱法对屋盖结构在水平地震作用下的地震反应进行计算分析，并研究次应力及屋盖竖向支撑布置距离对桁架的影响。     

我国大跨空间钢结构应用发展的主要特点

根据我国网架、网壳、管桁结构等大跨空间钢结构获得广泛应用的实际情况,将其归结为结构形式多样化、结构新材料应用的拓展及现代预应力技术的引入;并阐明推动大跨空间钢结构发展的源动力是产、学、研的紧密结合,是一系列空间结构行业标准的制定及企业资质论证与建筑管理的加强。     

体育场结构设计(案例分析)

以具体工程实例探讨体育场结构设计过程中常见的问题,如看台梁布置、底部钢筋混凝土框架如何与上部网架结构结合等。     

浅谈对几种新型建筑工程结构体系的认识

随着建筑设计的不断创新,结构设计理论、高强材料的不断发展,几种新型建筑结构体系正被越来越广泛的应用。本文要介绍了几种新的建筑结构体系,包括钢—混凝土混合结构、网架结构、高效预应力结构和膜结构。     

建筑用圆竹拱形规格材研究展望

竹材是一种优质的工程结构材料,圆竹建筑中普遍采用竹拱作为主要受力构件,不仅承受力强、不易变形、天然环保、透气性好,而且丰富了竹建筑的设计语言,呈现出各种造型,如穹顶、梁柱框架、桁架网架、编织结构等,具有极高的艺术和实用价值。目前,拱形圆竹材加工工艺主要依赖火烤软化定型,工业化程度低,生产效率低下,产品性能参数不准确,无...     

水泥轻质保温防水墙板

该墙板以“钢塑板”(钢丝网架聚苯乙烯芯板)为骨架，外包轻质砂浆(陶粒砂浆)或用细石混凝土复合而成，是一种具有保温、隔音、防水功能的新型墙板。钢塑板由三维空间焊接钢丝网架、内填阻燃型聚苯乙烯泡沫板条或整板构成。该墙板采用工厂预制现场吊装，通过墙板内设有的预埋件与梁柱等进行焊接，连接牢固可靠、施工快、质量好、劳动强度低，缝隙间填充泡塑板并与聚氨酯发泡同时使用，解决了墙体的“冷桥”问题。     

农村配电网网架结构规划方法研究

对农村配电网规划存在的问题进行了分析,指出规划工作的重点内容,分析了几种规划方法和网架规划中采用的智能优化算法,肯定了智能技术在电网规划领域的应用。     

移动模架在50m跨径现浇箱梁中的应用

根据移动模架在温州某桥50m跨径现浇箱梁施工中的应用情况，详细介绍了移动模架的构造、工作原理和现浇箱梁的施工工艺；通过利用移动模架进行跨径50m现浇箱梁施工的经验总结，指出了其在大跨径现浇箱梁施工过程中的经济性和施工质量及工期等方面的优越性；针对移动模架的技术要求，指出了其在中大跨径现浇箱梁中的应用前景。     

国产木桁架齿板连接件的研发

测试进口齿板与国产落叶松连接节点的拉伸性能,结果表明国产落叶松规格材完全可以替代美国南方松来制作齿板连接木桁架。提出3种国产齿板设计方案,使用国产镀锌钢板制作了国产齿板,并对国产齿板连接节点进行测试,指出国产齿板达到了批量生产的要求,改进方案可以提高齿板连接的性能,但国产齿板需要在加工工艺上进行调整,才能用于实际木桁架生产。     

ANSYS在木结构构件中的应用

介绍了大型通用有限元软件ANSYS的特点和进行有限元分析的一般步骤。通过在木桁架、木结构剪力墙和木结构楼板3种结构中应用得知,ANSYS可以用于对木结构构件的建模和应力分析以及进行相应的力学性能预测,且研究精度高、速度快,可节约大量的产品试制和试验经费,同时还可以实现对结构的优化。     

Strength and stiffness capacity utilisation of timber members in roof truss structures

The main objective of this study was to determine which property, of the six strength and stiffness properties used in structural timber design, was the most influential in the design of nail-plated roof trusses. Thirty recently completed nail-plated roof truss designs were randomly selected from three roof truss manufacturing plants and a total of 8 758 individual truss members were analysed for bending stress, shear stress parallel to grain, tensile stress parallel to grain, compression stress parallel to grain and deflection. The mean strength and stiffness capacity utilised of all the different design properties was well below 50% for all of the different dimension classes. Of all the individual strength properties, the mean bending strength capacity utilised per member was found to be the highest. The results of this study can be used for decision support related to wood property evaluation through? out the structural lumber value chain where roof truss members are the end products.     

上承式钢桁梁桥的刚度分析

将列车-上承式钢桁梁桥视为一个整体振动系统。上承式钢桁梁桥采用桁段有限元法离散,列车采用具有26个自由度的二系弹簧车辆空间振动模型。应用弹性系统动力学总势能不变值原理及形成矩阵的"对号入座"法则,建立列车-桥梁时变系统的整体振动方程。以车辆构架在桥上实测的蛇形波作为激振源,计算了列车以不同的速度通过上承式桥梁时列车的振动响应,分析结果表明,该上承式钢桁梁桥具有足够的横、竖向刚度。     

Deformation analysis of timber-framed panel dome structure I: simulation of a dome model connected by elastic springs

This study develops an analytical method that enables the simulation of the deformation of timber-framed plywood panel dome structures, of which strength is largely governed by the rigidity of joints. A hybrid truss structure model was employed to analyze this structure. In this model, we aimed to incorporate the mechanical properties of bolted and nailed joints, which were employed to build the structures, although the present investigation focused on the deformation characteristics of a dome in which the panel elements were connected mutually by elastic springs. The results of the theoretical analysis are compared with those obtained by experiments. The simulated results were found to be in good agreement with the results of the experiments under similar loading conditions.     

The potential of young,green finger-jointed Eucalyptus grandis lumber for roof truss manufacturing

South Africa is a timber-scarce country that will most probably experience a shortage of structural softwood lumber in the near future. In this study the concept of using young, green finger-jointed Eucalyptus grandis lumber was evaluated for possible application in roof truss structures while the timber is still in the green, unseasoned state. Drying will occur naturally while the lumber is fixed within the roof truss structure. The objectives of this study were (1) to investigate the strength and stiffness variation of the finger-jointed E. grandis product in both the green and dry state for different age and dimension lumber, (2) to investigate the variation in density, warp and checking in the lumber when dried in a simulated roof-space environment and (3) to evaluate the potential of this finger-jointed product as a component in roof truss structures. Green finger-jointed E. grandis lumber of ages 5, 11 and 18 years and dimensions 48×73?mm and 36×111?mm from Limpopo province were evaluated. The study showed that the young finger-jointed E. grandis timber had very good flexural, tensile parallel to grain, and shear properties in both the green and dry state. The mean and characteristic modulus of elasticity and modulus of rupture values of the finger-jointed E. grandis product were higher and the variation lower in comparison to currently used South African pine sources. The tensile perpendicular to grain and compression perpendicular to grain strength did not conform to SANS requirements for the lowest structural grade (S5). Both tree age and product dimension were sources for variation in the physical and strength properties. Based on the results from this study the concept of producing roof trusses from green, finger-jointed young E. grandis timber has potential.     

简述采用滑移法安装21m钢屋架的方法

在黑龙江省苇河林业局俱乐部内,采用滑移法对跨距21m、安装高度12.4m的钢屋架进行了安装试验。施工实践表明：采用滑移法在施工场地较小或受吊装设备条件限制的情况下进行钢屋架安装,不但可行,而且施工安全、保证了施工质量和进度。